Rotary tempering furnace



Dern 9, 1930. E. @Ems 1,784,427

i ROTARY TEMPERING Hummm Filed Aug. 6, 1928 2 Sheets-Sheet 1 Inl/anan- Efm Gom Dec. 9, 1930. E. GOERIG ROTARY TEMPERING FURNAGE -2 Sheets-Sheet 2 Filed Aug. 6, 1928 ab lsb I A fhg-H723 Patented Dec. 9, 1930 1 'i Y sTATEs y,

ERNST Gonnie, on MANNHEIM, GERMANY ROTARY rniirrnniNerV FURNACEV H Application iiled August 6, 1928, Serial No. 297,583, and. in Germany August 12,` 1927.

My invention relates to improvements in frontwall. 9of the furnace, packing rings rotary tempering furnaces, and more parl being provided between the bearing block ticularly in furnaces which are provided 7 and the pipe r. To the pipe r a worm gear with means for inserting and gasifying a 1l isl Xed which is in mesh with a worm 12 5 tempering powder, the said gasiiied powder adapted to'be rotated` for imparting rot-aryA 55 acting at elevated temperature and under movement tothe pipe 4. pressure. One of the objects of the improve- Concentrieally ofthe pipe r a pyrometer ments is to provide a furnace of this type tube p" is loosely mounted within the worin in which the means supplying the tempering S, and the said tube is welded to a hub dv 1U powder are constructed so as to permit the made in a lid 13 secured to the outer end of 60 powder to be slowly and gradually supplied thebearing block 7. The said bearing block to the furnace, so that the tempering gas is is formed witha chamber 14 traversed by the gradually developed, and to supply a new intake endiof the worm s and connected with charge of the hardening powder in the course a funnel 15 adapted to be closed by a lid 16.

of the tempering operation. The said means In the operation of the apparatus the pow- 65 are constructed so that the powder can be der for tempering is illed into the funnel 15 supplied without opening the furnace, and and the chamber 14, whereupon the lid 16 without relieving the pressure of the temis fixed to the funnel 15 in an air-tight inanpering gas conned within the furnace. ner. Now, rotary movement is imparted to With these objects in view my invention the pipe'4 by means of the wormr gearing 11, 70

consists in the matters to be described here- 12. rlLhe worin s takes part in the saidV roinafter and particularly pointed out in the tary movement, and it gradually carries the appended claims. powder from the chamber 14 into the fur- A For the purpose of explaining the invennace, where it is Vaporized by heat.

si tion two exampies embodying the same have An important' feature Vof` my improved 75 been Shown in the accompanying drawings construction is that the apparatus for supin which the same reference characters have plying the i powder to ,the pipe `4 can be been used in all the views to indicate corremounted without providing additional opensponding parts. In said drawings, ings in the pipe 4, the said parts being con- Fig.` l, is a sectional elevation of one end nected with the opening provided for in- 8o of the rotary furnace and the means for supserting the pyrometer tube p. By retarding plying the tempering powder thereto. or accelerating the rotary movement of the Fig. 2, is a sectional elevation showing a drum the amount of the powder supplied to M modication. the pipe 4jis regulated. Further, the pipe Fig. 3, is across section on the line III-III w and the worm s can be readily removed Of Fig/2 fromthe pipe 4 for inserting a worm s hav- In the @fiamme Shown in Fgl the f u" ing another pitch, so that the volume of pownace COmPUSQS a heatmg Chamber 3 havlng der inserted by mea-ns of the worms can be one or moy@ 13.11383 if @tammy mounfed there varied by. providing worms of dii'ierent in, the said pipes being provided with a gate pitches. for inserting and removing the obiects to be vIn Fig 2 and Fig 37 I have Shown a modi tempered commu-many of the plpedl a iication in'which additional means` are proplpe 711s Xed to. an mner- Img 5 an an vided for controlling the supply of the powf outer rino 6 secured to the pipe 4, and to the l 7 n der to the pipe 4. The4 construction of tie 95 inner wall of the pipe r a worm s is fixed Y 1. b welding the welding of the worm being P11385 4 and 7': the Worm 5" the belmg block y D 7 the bracket 8, the worm gearing 11, 12,

referably eected through boresmmade in p n p Jltjhe wall of the pipe r. .Thte pipe 1 is guided at @he py'omete' tube. 2% 'the hd 10 and the its outer end in a cylindrical bearing block Chamber 14 are the Same aS has been de- 7 made integral with a bracket 8 fixed to the scribed with reference to Fig. 1, and the same 100 letters of reference Vhave been used to indicate corresponding parts.

On the top of the funnel 15 a distributing device isfpi'ovided, which consists of a cylinthe casing b and ini a hub 19 of the lid a the Vwheel V e.

of the casing b, a Worm gearing L, i being provided for imparting'rotary movement to* The said.V wheel,A comprises aA cylinder 20 which is open at its'top and bottom, and which isyprovided, with ,radialA partitions dividing the saine into segmental chambers 22. The'lid a is provided at one sidelwith an'intake! 23 in position for successively communicating with the .chambers 22. The chambers 22 are adaptedtoA bev closed at their bottomsbyfgatesif hinged tor the wheel e near one end of each chamber,` 1

and the bottom 1S isf for-med` atthe side diametrically opposite to the. intake v23jwith an opening 24 the area of,wvliichcorresponds to and is greater than the area of the gates f.

Upon rotation of the `wheel e ley-means of the. `worm gearing c', 71;, the gate f passes acrosstheY opening 24 and ydrops downwardly by grav ity, thus opening the corresponding chamber 22 to thefunnel l'and the chamber 14. i

To each of the gates j a leaf spring g is secured which. tends to ,rock the *gate*v upwardly into positionfforv closing its chainber 22. The cylinder 20 is provided with holes 25 one for each,y of vthe lchambi-irs 22, the said holes being ladaptedfor communication with a` U-shaped pipe 7s extending through thewall of the casing b .and leading to the funnel, 15. Holes ov are provided inthe hub'of wheel eA gto connect each chaniberrd22 with the atmosphereby indexingfwith Mthe end of a channel o vprovided in trunnion 17 and the hub of Wheel 71, immediately before` the chamber 22 becomes adjacent to thein-v take 23. f .y f

In the operation of thel apparatus shown inr Fig. 2. the pipe 4 is rotated byrmeans of the worm gearing 11, 12, the powder for tempering is supplied to the intake 23, and

the wheel e is slowly rotated. `Thus' meas-` ured amounts of the powder drop intothe chambers 22 moving below the intake 23 the said powder being supported on the gates j". When a chamber'which has thus received a charge of powder arrives above the hole 24 made in the bottom 18 the gate j drops by gravity into the position shown in Fig. 2, so that the powder is delivered into the chamber 14. As the said chamber 22 continues its movement, it engages the radial margin of said hole 24, and it is rocked thereby upwardly andinto position for closing the chamber 22. After pressure has been developed within the pipe 4 by vaporization of the powder, the saidpressureis transmitted Vignsaaa?" to the chamber 14, and it acts from below on the gates 7 thus pressing the same into tight engagement with the wheel e. Thus the escape of the gas from the pipe 4 is preventthat the pressure above and below the gate 7 is balanced, and the gate 7 is free to drop by gravity;y In order to relieve the pressure within the chamber 22 beforerrthe chamber arrives into position below the intake 23,

the v,holew'o in each vchamber lopening' into the atmosphere through channel'o is provided. Thus, when the chamber l2J Varrives below the intake 23 it contains' gas oflatmospheric pressure, Vso that there' isgno danger of the powder storedwithin Vthe intake 23 beingblown out of the ,said intake. f

For regulating the supply'ofV powder the chamber 14 the velocity of the gear wheel z', 7L is varied, for example-by providing the,l g` for drivingthe worme with belt gearin stepped pulleys 27.

TvlVhat I claim is: Y

1. In a rotary case hardening furnace a tube withv a rotaryspipe fixed concentrically therein, a feedy worm enclosed'by Vsaid pipe. and fixed to the same,ra feedingA receptaclev I communicating with the receivingend of said pipe and said worm, means closing Said receptacle and a pyrometer tube arranged within said pipe andl extending coaxially tothe same Land to the-said worm. n

2. Ina rotary case yhardening furnace a tube'with a rotary pipe fixed concentricaily therein, a feed worm enclosed said pipe and fixed to the same, a feeding receptacle communicating with the receiving end of said pipe and lsaid worm,y a cylindrical cas.- ing fixed to the top of said Areceptacle and having a bottom provided with a hole,'a dis` tributing wheel within said casing open` at its top and bottom and' divided by partitions into chambers, means for rotating said .dis-

tributing wheel an` intake for successively vsupplyingv material to said chambers 'and hinged gatesvone for each of said chambers for Yclosing the sameat their bottoms. V

3. In a rotary case hardening furnace a tube with arotary pipe fixed concentrically therein,a feedv worm enclosed'by said pipe and fixed to the same, a feeding receptacle communicating with the receiving end of said pipe'and saidV worm, a cylindrical casing iixedto the top of said receptacle and having a bottom provided with a hole, a distributing wheel within said casing open at its top and'bottom and divided by partitions into chambers, means for rotating said distributing wheel, an intake for successively supplying material to said chambers, .hinged ygates one for each of said chambers forclosrotating said tube, said pipe and said Worm.

4. In a rotary case hardening furnace a tube With a rotary pipe fixed concentrically therein, a feed Worm enclosed by said pipe r and fixed to the same, a feeding receptacle communicating With the receiving end of said pipe and said Worm and a pyrometer tube arranged Within said tube and extending coaxially to the same and to the said ,O Worm.

5. In a rotary case hardening furnace a tube with a rotary pipe fixed concentrically therein, a feed Worm enclosed by said pipe and fixed to the same, a feeding receptacle f communicating With the receiving end of said pipe and said Worm, a pyrometer tube arranged Within said tube and extending coaxially to the same and to said Worm and removable mounting means in said feeding 5 receptacle permitting removal of said pipe,

Worm and pyrometer tube.

6. In a rotary case hardening furnace a 'tube with a rotary pipe fixed concentrically therein, a feed Worm enclosed by said pipe and fixed to the same, a feeding receptacle communicating With the receiving end of said pipe and said Worm, a cylindrical casing fixed to the top of said receptacle and having a bottom provided With a hole, a distributing Wheel Within said casing open at its top and bottom and divided by partitions into chambers7 means for rotating said distributing Wheel, an intake for successively supplying material to said chambers, hinged 3;, gates one for each of said chambers andV pressure equalizing means connected between said feeding receptacle and each chamber as the gate of the chamber moves adjacent to said hole in the bottom of said cylindrical casing.

7. In a rotary case hardening furnace a tube with a rotary pipe fixed concentrically therein, a feed Worm enclosed by said pipe and fixed to the same, a feeding receptacle 4;, communicating With the receiving end of said pipe and said Worm, a cylindrical casing fixed to the top of saidv receptacle and having a bottom provided With a hole, a distributing Wheel Within said casing open at so its top and bottom and divided by partitions into chambers, means for rotating said distributing Wheel, an intake for successively supplying material to said chambers, hinged gates one for each of said chambers and atm mospheric conduit means connected to each chamber after closing of the hinged gate anld before filling with material by said inta re.

In testimony whereof I have affixed my en Signature.

ERNST GOERIG. 

